Consider the problem from the frame of reference of the wind. The wind is still; you begin with the only energy source being the motion of the ground to the left, and using this energy, you are supposed to cause the vehicle to move to the right. You can’t cause rightward motion without violating the conservation of momentum unless you cause either the air to move to the left, or the ground to move faster to the left.
Consider the problem from the frame of reference of the wind. The wind is still; you begin with the only energy source being the motion of the ground to the left, and using this energy, you are supposed to cause the vehicle to move to the right. You can’t cause rightward motion without violating the conservation of momentum unless you cause either the air to move to the left, or the ground to move faster to the left.